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![David Howells](/assets/img/avatar_default.png)
Add a system call to make extended file information available, including file creation and some attribute flags where available through the underlying filesystem. The getattr inode operation is altered to take two additional arguments: a u32 request_mask and an unsigned int flags that indicate the synchronisation mode. This change is propagated to the vfs_getattr*() function. Functions like vfs_stat() are now inline wrappers around new functions vfs_statx() and vfs_statx_fd() to reduce stack usage. ======== OVERVIEW ======== The idea was initially proposed as a set of xattrs that could be retrieved with getxattr(), but the general preference proved to be for a new syscall with an extended stat structure. A number of requests were gathered for features to be included. The following have been included: (1) Make the fields a consistent size on all arches and make them large. (2) Spare space, request flags and information flags are provided for future expansion. (3) Better support for the y2038 problem [Arnd Bergmann] (tv_sec is an __s64). (4) Creation time: The SMB protocol carries the creation time, which could be exported by Samba, which will in turn help CIFS make use of FS-Cache as that can be used for coherency data (stx_btime). This is also specified in NFSv4 as a recommended attribute and could be exported by NFSD [Steve French]. (5) Lightweight stat: Ask for just those details of interest, and allow a netfs (such as NFS) to approximate anything not of interest, possibly without going to the server [Trond Myklebust, Ulrich Drepper, Andreas Dilger] (AT_STATX_DONT_SYNC). (6) Heavyweight stat: Force a netfs to go to the server, even if it thinks its cached attributes are up to date [Trond Myklebust] (AT_STATX_FORCE_SYNC). And the following have been left out for future extension: (7) Data version number: Could be used by userspace NFS servers [Aneesh Kumar]. Can also be used to modify fill_post_wcc() in NFSD which retrieves i_version directly, but has just called vfs_getattr(). It could get it from the kstat struct if it used vfs_xgetattr() instead. (There's disagreement on the exact semantics of a single field, since not all filesystems do this the same way). (8) BSD stat compatibility: Including more fields from the BSD stat such as creation time (st_btime) and inode generation number (st_gen) [Jeremy Allison, Bernd Schubert]. (9) Inode generation number: Useful for FUSE and userspace NFS servers [Bernd Schubert]. (This was asked for but later deemed unnecessary with the open-by-handle capability available and caused disagreement as to whether it's a security hole or not). (10) Extra coherency data may be useful in making backups [Andreas Dilger]. (No particular data were offered, but things like last backup timestamp, the data version number and the DOS archive bit would come into this category). (11) Allow the filesystem to indicate what it can/cannot provide: A filesystem can now say it doesn't support a standard stat feature if that isn't available, so if, for instance, inode numbers or UIDs don't exist or are fabricated locally... (This requires a separate system call - I have an fsinfo() call idea for this). (12) Store a 16-byte volume ID in the superblock that can be returned in struct xstat [Steve French]. (Deferred to fsinfo). (13) Include granularity fields in the time data to indicate the granularity of each of the times (NFSv4 time_delta) [Steve French]. (Deferred to fsinfo). (14) FS_IOC_GETFLAGS value. These could be translated to BSD's st_flags. Note that the Linux IOC flags are a mess and filesystems such as Ext4 define flags that aren't in linux/fs.h, so translation in the kernel may be a necessity (or, possibly, we provide the filesystem type too). (Some attributes are made available in stx_attributes, but the general feeling was that the IOC flags were to ext[234]-specific and shouldn't be exposed through statx this way). (15) Mask of features available on file (eg: ACLs, seclabel) [Brad Boyer, Michael Kerrisk]. (Deferred, probably to fsinfo. Finding out if there's an ACL or seclabal might require extra filesystem operations). (16) Femtosecond-resolution timestamps [Dave Chinner]. (A __reserved field has been left in the statx_timestamp struct for this - if there proves to be a need). (17) A set multiple attributes syscall to go with this. =============== NEW SYSTEM CALL =============== The new system call is: int ret = statx(int dfd, const char *filename, unsigned int flags, unsigned int mask, struct statx *buffer); The dfd, filename and flags parameters indicate the file to query, in a similar way to fstatat(). There is no equivalent of lstat() as that can be emulated with statx() by passing AT_SYMLINK_NOFOLLOW in flags. There is also no equivalent of fstat() as that can be emulated by passing a NULL filename to statx() with the fd of interest in dfd. Whether or not statx() synchronises the attributes with the backing store can be controlled by OR'ing a value into the flags argument (this typically only affects network filesystems): (1) AT_STATX_SYNC_AS_STAT tells statx() to behave as stat() does in this respect. (2) AT_STATX_FORCE_SYNC will require a network filesystem to synchronise its attributes with the server - which might require data writeback to occur to get the timestamps correct. (3) AT_STATX_DONT_SYNC will suppress synchronisation with the server in a network filesystem. The resulting values should be considered approximate. mask is a bitmask indicating the fields in struct statx that are of interest to the caller. The user should set this to STATX_BASIC_STATS to get the basic set returned by stat(). It should be noted that asking for more information may entail extra I/O operations. buffer points to the destination for the data. This must be 256 bytes in size. ====================== MAIN ATTRIBUTES RECORD ====================== The following structures are defined in which to return the main attribute set: struct statx_timestamp { __s64 tv_sec; __s32 tv_nsec; __s32 __reserved; }; struct statx { __u32 stx_mask; __u32 stx_blksize; __u64 stx_attributes; __u32 stx_nlink; __u32 stx_uid; __u32 stx_gid; __u16 stx_mode; __u16 __spare0[1]; __u64 stx_ino; __u64 stx_size; __u64 stx_blocks; __u64 __spare1[1]; struct statx_timestamp stx_atime; struct statx_timestamp stx_btime; struct statx_timestamp stx_ctime; struct statx_timestamp stx_mtime; __u32 stx_rdev_major; __u32 stx_rdev_minor; __u32 stx_dev_major; __u32 stx_dev_minor; __u64 __spare2[14]; }; The defined bits in request_mask and stx_mask are: STATX_TYPE Want/got stx_mode & S_IFMT STATX_MODE Want/got stx_mode & ~S_IFMT STATX_NLINK Want/got stx_nlink STATX_UID Want/got stx_uid STATX_GID Want/got stx_gid STATX_ATIME Want/got stx_atime{,_ns} STATX_MTIME Want/got stx_mtime{,_ns} STATX_CTIME Want/got stx_ctime{,_ns} STATX_INO Want/got stx_ino STATX_SIZE Want/got stx_size STATX_BLOCKS Want/got stx_blocks STATX_BASIC_STATS [The stuff in the normal stat struct] STATX_BTIME Want/got stx_btime{,_ns} STATX_ALL [All currently available stuff] stx_btime is the file creation time, stx_mask is a bitmask indicating the data provided and __spares*[] are where as-yet undefined fields can be placed. Time fields are structures with separate seconds and nanoseconds fields plus a reserved field in case we want to add even finer resolution. Note that times will be negative if before 1970; in such a case, the nanosecond fields will also be negative if not zero. The bits defined in the stx_attributes field convey information about a file, how it is accessed, where it is and what it does. The following attributes map to FS_*_FL flags and are the same numerical value: STATX_ATTR_COMPRESSED File is compressed by the fs STATX_ATTR_IMMUTABLE File is marked immutable STATX_ATTR_APPEND File is append-only STATX_ATTR_NODUMP File is not to be dumped STATX_ATTR_ENCRYPTED File requires key to decrypt in fs Within the kernel, the supported flags are listed by: KSTAT_ATTR_FS_IOC_FLAGS [Are any other IOC flags of sufficient general interest to be exposed through this interface?] New flags include: STATX_ATTR_AUTOMOUNT Object is an automount trigger These are for the use of GUI tools that might want to mark files specially, depending on what they are. Fields in struct statx come in a number of classes: (0) stx_dev_*, stx_blksize. These are local system information and are always available. (1) stx_mode, stx_nlinks, stx_uid, stx_gid, stx_[amc]time, stx_ino, stx_size, stx_blocks. These will be returned whether the caller asks for them or not. The corresponding bits in stx_mask will be set to indicate whether they actually have valid values. If the caller didn't ask for them, then they may be approximated. For example, NFS won't waste any time updating them from the server, unless as a byproduct of updating something requested. If the values don't actually exist for the underlying object (such as UID or GID on a DOS file), then the bit won't be set in the stx_mask, even if the caller asked for the value. In such a case, the returned value will be a fabrication. Note that there are instances where the type might not be valid, for instance Windows reparse points. (2) stx_rdev_*. This will be set only if stx_mode indicates we're looking at a blockdev or a chardev, otherwise will be 0. (3) stx_btime. Similar to (1), except this will be set to 0 if it doesn't exist. ======= TESTING ======= The following test program can be used to test the statx system call: samples/statx/test-statx.c Just compile and run, passing it paths to the files you want to examine. The file is built automatically if CONFIG_SAMPLES is enabled. Here's some example output. Firstly, an NFS directory that crosses to another FSID. Note that the AUTOMOUNT attribute is set because transiting this directory will cause d_automount to be invoked by the VFS. [root@andromeda ~]# /tmp/test-statx -A /warthog/data statx(/warthog/data) = 0 results=7ff Size: 4096 Blocks: 8 IO Block: 1048576 directory Device: 00:26 Inode: 1703937 Links: 125 Access: (3777/drwxrwxrwx) Uid: 0 Gid: 4041 Access: 2016-11-24 09:02:12.219699527+0000 Modify: 2016-11-17 10:44:36.225653653+0000 Change: 2016-11-17 10:44:36.225653653+0000 Attributes: 0000000000001000 (-------- -------- -------- -------- -------- -------- ---m---- --------) Secondly, the result of automounting on that directory. [root@andromeda ~]# /tmp/test-statx /warthog/data statx(/warthog/data) = 0 results=7ff Size: 4096 Blocks: 8 IO Block: 1048576 directory Device: 00:27 Inode: 2 Links: 125 Access: (3777/drwxrwxrwx) Uid: 0 Gid: 4041 Access: 2016-11-24 09:02:12.219699527+0000 Modify: 2016-11-17 10:44:36.225653653+0000 Change: 2016-11-17 10:44:36.225653653+0000 Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
1291 lines
32 KiB
C
1291 lines
32 KiB
C
/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_da_format.h"
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#include "xfs_inode.h"
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#include "xfs_bmap.h"
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#include "xfs_bmap_util.h"
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#include "xfs_acl.h"
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#include "xfs_quota.h"
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#include "xfs_error.h"
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#include "xfs_attr.h"
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#include "xfs_trans.h"
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#include "xfs_trace.h"
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#include "xfs_icache.h"
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#include "xfs_symlink.h"
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#include "xfs_da_btree.h"
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#include "xfs_dir2.h"
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#include "xfs_trans_space.h"
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#include "xfs_pnfs.h"
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#include "xfs_iomap.h"
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#include <linux/capability.h>
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#include <linux/xattr.h>
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#include <linux/posix_acl.h>
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#include <linux/security.h>
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#include <linux/iomap.h>
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#include <linux/slab.h>
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/*
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* Directories have different lock order w.r.t. mmap_sem compared to regular
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* files. This is due to readdir potentially triggering page faults on a user
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* buffer inside filldir(), and this happens with the ilock on the directory
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* held. For regular files, the lock order is the other way around - the
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* mmap_sem is taken during the page fault, and then we lock the ilock to do
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* block mapping. Hence we need a different class for the directory ilock so
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* that lockdep can tell them apart.
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*/
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static struct lock_class_key xfs_nondir_ilock_class;
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static struct lock_class_key xfs_dir_ilock_class;
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static int
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xfs_initxattrs(
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struct inode *inode,
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const struct xattr *xattr_array,
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void *fs_info)
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{
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const struct xattr *xattr;
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struct xfs_inode *ip = XFS_I(inode);
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int error = 0;
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for (xattr = xattr_array; xattr->name != NULL; xattr++) {
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error = xfs_attr_set(ip, xattr->name, xattr->value,
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xattr->value_len, ATTR_SECURE);
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if (error < 0)
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break;
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}
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return error;
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}
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/*
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* Hook in SELinux. This is not quite correct yet, what we really need
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* here (as we do for default ACLs) is a mechanism by which creation of
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* these attrs can be journalled at inode creation time (along with the
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* inode, of course, such that log replay can't cause these to be lost).
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*/
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STATIC int
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xfs_init_security(
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struct inode *inode,
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struct inode *dir,
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const struct qstr *qstr)
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{
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return security_inode_init_security(inode, dir, qstr,
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&xfs_initxattrs, NULL);
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}
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static void
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xfs_dentry_to_name(
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struct xfs_name *namep,
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struct dentry *dentry)
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{
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namep->name = dentry->d_name.name;
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namep->len = dentry->d_name.len;
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namep->type = XFS_DIR3_FT_UNKNOWN;
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}
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static int
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xfs_dentry_mode_to_name(
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struct xfs_name *namep,
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struct dentry *dentry,
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int mode)
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{
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namep->name = dentry->d_name.name;
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namep->len = dentry->d_name.len;
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namep->type = xfs_mode_to_ftype(mode);
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if (unlikely(namep->type == XFS_DIR3_FT_UNKNOWN))
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return -EFSCORRUPTED;
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return 0;
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}
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STATIC void
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xfs_cleanup_inode(
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struct inode *dir,
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struct inode *inode,
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struct dentry *dentry)
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{
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struct xfs_name teardown;
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/* Oh, the horror.
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* If we can't add the ACL or we fail in
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* xfs_init_security we must back out.
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* ENOSPC can hit here, among other things.
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*/
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xfs_dentry_to_name(&teardown, dentry);
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xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
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}
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STATIC int
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xfs_generic_create(
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struct inode *dir,
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struct dentry *dentry,
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umode_t mode,
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dev_t rdev,
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bool tmpfile) /* unnamed file */
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{
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struct inode *inode;
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struct xfs_inode *ip = NULL;
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struct posix_acl *default_acl, *acl;
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struct xfs_name name;
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int error;
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/*
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* Irix uses Missed'em'V split, but doesn't want to see
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* the upper 5 bits of (14bit) major.
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*/
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if (S_ISCHR(mode) || S_ISBLK(mode)) {
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if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
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return -EINVAL;
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rdev = sysv_encode_dev(rdev);
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} else {
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rdev = 0;
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}
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error = posix_acl_create(dir, &mode, &default_acl, &acl);
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if (error)
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return error;
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/* Verify mode is valid also for tmpfile case */
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error = xfs_dentry_mode_to_name(&name, dentry, mode);
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if (unlikely(error))
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goto out_free_acl;
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if (!tmpfile) {
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error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip);
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} else {
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error = xfs_create_tmpfile(XFS_I(dir), dentry, mode, &ip);
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}
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if (unlikely(error))
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goto out_free_acl;
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inode = VFS_I(ip);
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error = xfs_init_security(inode, dir, &dentry->d_name);
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if (unlikely(error))
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goto out_cleanup_inode;
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#ifdef CONFIG_XFS_POSIX_ACL
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if (default_acl) {
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error = xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
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if (error)
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goto out_cleanup_inode;
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}
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if (acl) {
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error = xfs_set_acl(inode, acl, ACL_TYPE_ACCESS);
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if (error)
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goto out_cleanup_inode;
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}
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#endif
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xfs_setup_iops(ip);
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if (tmpfile)
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d_tmpfile(dentry, inode);
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else
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d_instantiate(dentry, inode);
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xfs_finish_inode_setup(ip);
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out_free_acl:
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if (default_acl)
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posix_acl_release(default_acl);
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if (acl)
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posix_acl_release(acl);
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return error;
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out_cleanup_inode:
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xfs_finish_inode_setup(ip);
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if (!tmpfile)
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xfs_cleanup_inode(dir, inode, dentry);
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iput(inode);
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goto out_free_acl;
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}
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STATIC int
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xfs_vn_mknod(
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struct inode *dir,
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struct dentry *dentry,
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umode_t mode,
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dev_t rdev)
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{
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return xfs_generic_create(dir, dentry, mode, rdev, false);
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}
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STATIC int
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xfs_vn_create(
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struct inode *dir,
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struct dentry *dentry,
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umode_t mode,
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bool flags)
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{
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return xfs_vn_mknod(dir, dentry, mode, 0);
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}
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STATIC int
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xfs_vn_mkdir(
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struct inode *dir,
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struct dentry *dentry,
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umode_t mode)
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{
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return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0);
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}
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STATIC struct dentry *
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xfs_vn_lookup(
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struct inode *dir,
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struct dentry *dentry,
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unsigned int flags)
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{
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struct xfs_inode *cip;
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struct xfs_name name;
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int error;
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if (dentry->d_name.len >= MAXNAMELEN)
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return ERR_PTR(-ENAMETOOLONG);
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xfs_dentry_to_name(&name, dentry);
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error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
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if (unlikely(error)) {
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if (unlikely(error != -ENOENT))
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return ERR_PTR(error);
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d_add(dentry, NULL);
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return NULL;
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}
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return d_splice_alias(VFS_I(cip), dentry);
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}
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STATIC struct dentry *
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xfs_vn_ci_lookup(
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struct inode *dir,
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struct dentry *dentry,
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unsigned int flags)
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{
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struct xfs_inode *ip;
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struct xfs_name xname;
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struct xfs_name ci_name;
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struct qstr dname;
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int error;
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if (dentry->d_name.len >= MAXNAMELEN)
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return ERR_PTR(-ENAMETOOLONG);
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xfs_dentry_to_name(&xname, dentry);
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error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
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if (unlikely(error)) {
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if (unlikely(error != -ENOENT))
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return ERR_PTR(error);
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/*
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* call d_add(dentry, NULL) here when d_drop_negative_children
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* is called in xfs_vn_mknod (ie. allow negative dentries
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* with CI filesystems).
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*/
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return NULL;
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}
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/* if exact match, just splice and exit */
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if (!ci_name.name)
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return d_splice_alias(VFS_I(ip), dentry);
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/* else case-insensitive match... */
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dname.name = ci_name.name;
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dname.len = ci_name.len;
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dentry = d_add_ci(dentry, VFS_I(ip), &dname);
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kmem_free(ci_name.name);
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return dentry;
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}
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STATIC int
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xfs_vn_link(
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struct dentry *old_dentry,
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struct inode *dir,
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struct dentry *dentry)
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{
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struct inode *inode = d_inode(old_dentry);
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struct xfs_name name;
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int error;
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error = xfs_dentry_mode_to_name(&name, dentry, inode->i_mode);
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if (unlikely(error))
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return error;
|
|
|
|
error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
|
|
if (unlikely(error))
|
|
return error;
|
|
|
|
ihold(inode);
|
|
d_instantiate(dentry, inode);
|
|
return 0;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_vn_unlink(
|
|
struct inode *dir,
|
|
struct dentry *dentry)
|
|
{
|
|
struct xfs_name name;
|
|
int error;
|
|
|
|
xfs_dentry_to_name(&name, dentry);
|
|
|
|
error = xfs_remove(XFS_I(dir), &name, XFS_I(d_inode(dentry)));
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* With unlink, the VFS makes the dentry "negative": no inode,
|
|
* but still hashed. This is incompatible with case-insensitive
|
|
* mode, so invalidate (unhash) the dentry in CI-mode.
|
|
*/
|
|
if (xfs_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb))
|
|
d_invalidate(dentry);
|
|
return 0;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_vn_symlink(
|
|
struct inode *dir,
|
|
struct dentry *dentry,
|
|
const char *symname)
|
|
{
|
|
struct inode *inode;
|
|
struct xfs_inode *cip = NULL;
|
|
struct xfs_name name;
|
|
int error;
|
|
umode_t mode;
|
|
|
|
mode = S_IFLNK |
|
|
(irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
|
|
error = xfs_dentry_mode_to_name(&name, dentry, mode);
|
|
if (unlikely(error))
|
|
goto out;
|
|
|
|
error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip);
|
|
if (unlikely(error))
|
|
goto out;
|
|
|
|
inode = VFS_I(cip);
|
|
|
|
error = xfs_init_security(inode, dir, &dentry->d_name);
|
|
if (unlikely(error))
|
|
goto out_cleanup_inode;
|
|
|
|
xfs_setup_iops(cip);
|
|
|
|
d_instantiate(dentry, inode);
|
|
xfs_finish_inode_setup(cip);
|
|
return 0;
|
|
|
|
out_cleanup_inode:
|
|
xfs_finish_inode_setup(cip);
|
|
xfs_cleanup_inode(dir, inode, dentry);
|
|
iput(inode);
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_vn_rename(
|
|
struct inode *odir,
|
|
struct dentry *odentry,
|
|
struct inode *ndir,
|
|
struct dentry *ndentry,
|
|
unsigned int flags)
|
|
{
|
|
struct inode *new_inode = d_inode(ndentry);
|
|
int omode = 0;
|
|
int error;
|
|
struct xfs_name oname;
|
|
struct xfs_name nname;
|
|
|
|
if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
|
|
return -EINVAL;
|
|
|
|
/* if we are exchanging files, we need to set i_mode of both files */
|
|
if (flags & RENAME_EXCHANGE)
|
|
omode = d_inode(ndentry)->i_mode;
|
|
|
|
error = xfs_dentry_mode_to_name(&oname, odentry, omode);
|
|
if (omode && unlikely(error))
|
|
return error;
|
|
|
|
error = xfs_dentry_mode_to_name(&nname, ndentry,
|
|
d_inode(odentry)->i_mode);
|
|
if (unlikely(error))
|
|
return error;
|
|
|
|
return xfs_rename(XFS_I(odir), &oname, XFS_I(d_inode(odentry)),
|
|
XFS_I(ndir), &nname,
|
|
new_inode ? XFS_I(new_inode) : NULL, flags);
|
|
}
|
|
|
|
/*
|
|
* careful here - this function can get called recursively, so
|
|
* we need to be very careful about how much stack we use.
|
|
* uio is kmalloced for this reason...
|
|
*/
|
|
STATIC const char *
|
|
xfs_vn_get_link(
|
|
struct dentry *dentry,
|
|
struct inode *inode,
|
|
struct delayed_call *done)
|
|
{
|
|
char *link;
|
|
int error = -ENOMEM;
|
|
|
|
if (!dentry)
|
|
return ERR_PTR(-ECHILD);
|
|
|
|
link = kmalloc(MAXPATHLEN+1, GFP_KERNEL);
|
|
if (!link)
|
|
goto out_err;
|
|
|
|
error = xfs_readlink(XFS_I(d_inode(dentry)), link);
|
|
if (unlikely(error))
|
|
goto out_kfree;
|
|
|
|
set_delayed_call(done, kfree_link, link);
|
|
return link;
|
|
|
|
out_kfree:
|
|
kfree(link);
|
|
out_err:
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
STATIC const char *
|
|
xfs_vn_get_link_inline(
|
|
struct dentry *dentry,
|
|
struct inode *inode,
|
|
struct delayed_call *done)
|
|
{
|
|
ASSERT(XFS_I(inode)->i_df.if_flags & XFS_IFINLINE);
|
|
return XFS_I(inode)->i_df.if_u1.if_data;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_vn_getattr(
|
|
const struct path *path,
|
|
struct kstat *stat,
|
|
u32 request_mask,
|
|
unsigned int query_flags)
|
|
{
|
|
struct inode *inode = d_inode(path->dentry);
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
|
|
trace_xfs_getattr(ip);
|
|
|
|
if (XFS_FORCED_SHUTDOWN(mp))
|
|
return -EIO;
|
|
|
|
stat->size = XFS_ISIZE(ip);
|
|
stat->dev = inode->i_sb->s_dev;
|
|
stat->mode = inode->i_mode;
|
|
stat->nlink = inode->i_nlink;
|
|
stat->uid = inode->i_uid;
|
|
stat->gid = inode->i_gid;
|
|
stat->ino = ip->i_ino;
|
|
stat->atime = inode->i_atime;
|
|
stat->mtime = inode->i_mtime;
|
|
stat->ctime = inode->i_ctime;
|
|
stat->blocks =
|
|
XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
|
|
|
|
|
|
switch (inode->i_mode & S_IFMT) {
|
|
case S_IFBLK:
|
|
case S_IFCHR:
|
|
stat->blksize = BLKDEV_IOSIZE;
|
|
stat->rdev = MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
|
|
sysv_minor(ip->i_df.if_u2.if_rdev));
|
|
break;
|
|
default:
|
|
if (XFS_IS_REALTIME_INODE(ip)) {
|
|
/*
|
|
* If the file blocks are being allocated from a
|
|
* realtime volume, then return the inode's realtime
|
|
* extent size or the realtime volume's extent size.
|
|
*/
|
|
stat->blksize =
|
|
xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog;
|
|
} else
|
|
stat->blksize = xfs_preferred_iosize(mp);
|
|
stat->rdev = 0;
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
xfs_setattr_mode(
|
|
struct xfs_inode *ip,
|
|
struct iattr *iattr)
|
|
{
|
|
struct inode *inode = VFS_I(ip);
|
|
umode_t mode = iattr->ia_mode;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
|
|
|
|
inode->i_mode &= S_IFMT;
|
|
inode->i_mode |= mode & ~S_IFMT;
|
|
}
|
|
|
|
void
|
|
xfs_setattr_time(
|
|
struct xfs_inode *ip,
|
|
struct iattr *iattr)
|
|
{
|
|
struct inode *inode = VFS_I(ip);
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
|
|
|
|
if (iattr->ia_valid & ATTR_ATIME)
|
|
inode->i_atime = iattr->ia_atime;
|
|
if (iattr->ia_valid & ATTR_CTIME)
|
|
inode->i_ctime = iattr->ia_ctime;
|
|
if (iattr->ia_valid & ATTR_MTIME)
|
|
inode->i_mtime = iattr->ia_mtime;
|
|
}
|
|
|
|
static int
|
|
xfs_vn_change_ok(
|
|
struct dentry *dentry,
|
|
struct iattr *iattr)
|
|
{
|
|
struct xfs_mount *mp = XFS_I(d_inode(dentry))->i_mount;
|
|
|
|
if (mp->m_flags & XFS_MOUNT_RDONLY)
|
|
return -EROFS;
|
|
|
|
if (XFS_FORCED_SHUTDOWN(mp))
|
|
return -EIO;
|
|
|
|
return setattr_prepare(dentry, iattr);
|
|
}
|
|
|
|
/*
|
|
* Set non-size attributes of an inode.
|
|
*
|
|
* Caution: The caller of this function is responsible for calling
|
|
* setattr_prepare() or otherwise verifying the change is fine.
|
|
*/
|
|
int
|
|
xfs_setattr_nonsize(
|
|
struct xfs_inode *ip,
|
|
struct iattr *iattr,
|
|
int flags)
|
|
{
|
|
xfs_mount_t *mp = ip->i_mount;
|
|
struct inode *inode = VFS_I(ip);
|
|
int mask = iattr->ia_valid;
|
|
xfs_trans_t *tp;
|
|
int error;
|
|
kuid_t uid = GLOBAL_ROOT_UID, iuid = GLOBAL_ROOT_UID;
|
|
kgid_t gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID;
|
|
struct xfs_dquot *udqp = NULL, *gdqp = NULL;
|
|
struct xfs_dquot *olddquot1 = NULL, *olddquot2 = NULL;
|
|
|
|
ASSERT((mask & ATTR_SIZE) == 0);
|
|
|
|
/*
|
|
* If disk quotas is on, we make sure that the dquots do exist on disk,
|
|
* before we start any other transactions. Trying to do this later
|
|
* is messy. We don't care to take a readlock to look at the ids
|
|
* in inode here, because we can't hold it across the trans_reserve.
|
|
* If the IDs do change before we take the ilock, we're covered
|
|
* because the i_*dquot fields will get updated anyway.
|
|
*/
|
|
if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
|
|
uint qflags = 0;
|
|
|
|
if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
|
|
uid = iattr->ia_uid;
|
|
qflags |= XFS_QMOPT_UQUOTA;
|
|
} else {
|
|
uid = inode->i_uid;
|
|
}
|
|
if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
|
|
gid = iattr->ia_gid;
|
|
qflags |= XFS_QMOPT_GQUOTA;
|
|
} else {
|
|
gid = inode->i_gid;
|
|
}
|
|
|
|
/*
|
|
* We take a reference when we initialize udqp and gdqp,
|
|
* so it is important that we never blindly double trip on
|
|
* the same variable. See xfs_create() for an example.
|
|
*/
|
|
ASSERT(udqp == NULL);
|
|
ASSERT(gdqp == NULL);
|
|
error = xfs_qm_vop_dqalloc(ip, xfs_kuid_to_uid(uid),
|
|
xfs_kgid_to_gid(gid),
|
|
xfs_get_projid(ip),
|
|
qflags, &udqp, &gdqp, NULL);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
|
|
if (error)
|
|
goto out_dqrele;
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ijoin(tp, ip, 0);
|
|
|
|
/*
|
|
* Change file ownership. Must be the owner or privileged.
|
|
*/
|
|
if (mask & (ATTR_UID|ATTR_GID)) {
|
|
/*
|
|
* These IDs could have changed since we last looked at them.
|
|
* But, we're assured that if the ownership did change
|
|
* while we didn't have the inode locked, inode's dquot(s)
|
|
* would have changed also.
|
|
*/
|
|
iuid = inode->i_uid;
|
|
igid = inode->i_gid;
|
|
gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
|
|
uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
|
|
|
|
/*
|
|
* Do a quota reservation only if uid/gid is actually
|
|
* going to change.
|
|
*/
|
|
if (XFS_IS_QUOTA_RUNNING(mp) &&
|
|
((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) ||
|
|
(XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) {
|
|
ASSERT(tp);
|
|
error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
|
|
NULL, capable(CAP_FOWNER) ?
|
|
XFS_QMOPT_FORCE_RES : 0);
|
|
if (error) /* out of quota */
|
|
goto out_cancel;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Change file ownership. Must be the owner or privileged.
|
|
*/
|
|
if (mask & (ATTR_UID|ATTR_GID)) {
|
|
/*
|
|
* CAP_FSETID overrides the following restrictions:
|
|
*
|
|
* The set-user-ID and set-group-ID bits of a file will be
|
|
* cleared upon successful return from chown()
|
|
*/
|
|
if ((inode->i_mode & (S_ISUID|S_ISGID)) &&
|
|
!capable(CAP_FSETID))
|
|
inode->i_mode &= ~(S_ISUID|S_ISGID);
|
|
|
|
/*
|
|
* Change the ownerships and register quota modifications
|
|
* in the transaction.
|
|
*/
|
|
if (!uid_eq(iuid, uid)) {
|
|
if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
|
|
ASSERT(mask & ATTR_UID);
|
|
ASSERT(udqp);
|
|
olddquot1 = xfs_qm_vop_chown(tp, ip,
|
|
&ip->i_udquot, udqp);
|
|
}
|
|
ip->i_d.di_uid = xfs_kuid_to_uid(uid);
|
|
inode->i_uid = uid;
|
|
}
|
|
if (!gid_eq(igid, gid)) {
|
|
if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
|
|
ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) ||
|
|
!XFS_IS_PQUOTA_ON(mp));
|
|
ASSERT(mask & ATTR_GID);
|
|
ASSERT(gdqp);
|
|
olddquot2 = xfs_qm_vop_chown(tp, ip,
|
|
&ip->i_gdquot, gdqp);
|
|
}
|
|
ip->i_d.di_gid = xfs_kgid_to_gid(gid);
|
|
inode->i_gid = gid;
|
|
}
|
|
}
|
|
|
|
if (mask & ATTR_MODE)
|
|
xfs_setattr_mode(ip, iattr);
|
|
if (mask & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
|
|
xfs_setattr_time(ip, iattr);
|
|
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
|
|
|
XFS_STATS_INC(mp, xs_ig_attrchg);
|
|
|
|
if (mp->m_flags & XFS_MOUNT_WSYNC)
|
|
xfs_trans_set_sync(tp);
|
|
error = xfs_trans_commit(tp);
|
|
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
|
|
/*
|
|
* Release any dquot(s) the inode had kept before chown.
|
|
*/
|
|
xfs_qm_dqrele(olddquot1);
|
|
xfs_qm_dqrele(olddquot2);
|
|
xfs_qm_dqrele(udqp);
|
|
xfs_qm_dqrele(gdqp);
|
|
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* XXX(hch): Updating the ACL entries is not atomic vs the i_mode
|
|
* update. We could avoid this with linked transactions
|
|
* and passing down the transaction pointer all the way
|
|
* to attr_set. No previous user of the generic
|
|
* Posix ACL code seems to care about this issue either.
|
|
*/
|
|
if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) {
|
|
error = posix_acl_chmod(inode, inode->i_mode);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_cancel:
|
|
xfs_trans_cancel(tp);
|
|
out_dqrele:
|
|
xfs_qm_dqrele(udqp);
|
|
xfs_qm_dqrele(gdqp);
|
|
return error;
|
|
}
|
|
|
|
int
|
|
xfs_vn_setattr_nonsize(
|
|
struct dentry *dentry,
|
|
struct iattr *iattr)
|
|
{
|
|
struct xfs_inode *ip = XFS_I(d_inode(dentry));
|
|
int error;
|
|
|
|
trace_xfs_setattr(ip);
|
|
|
|
error = xfs_vn_change_ok(dentry, iattr);
|
|
if (error)
|
|
return error;
|
|
return xfs_setattr_nonsize(ip, iattr, 0);
|
|
}
|
|
|
|
/*
|
|
* Truncate file. Must have write permission and not be a directory.
|
|
*
|
|
* Caution: The caller of this function is responsible for calling
|
|
* setattr_prepare() or otherwise verifying the change is fine.
|
|
*/
|
|
int
|
|
xfs_setattr_size(
|
|
struct xfs_inode *ip,
|
|
struct iattr *iattr)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct inode *inode = VFS_I(ip);
|
|
xfs_off_t oldsize, newsize;
|
|
struct xfs_trans *tp;
|
|
int error;
|
|
uint lock_flags = 0;
|
|
bool did_zeroing = false;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
|
|
ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
|
|
ASSERT(S_ISREG(inode->i_mode));
|
|
ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
|
|
ATTR_MTIME_SET|ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0);
|
|
|
|
oldsize = inode->i_size;
|
|
newsize = iattr->ia_size;
|
|
|
|
/*
|
|
* Short circuit the truncate case for zero length files.
|
|
*/
|
|
if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) {
|
|
if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
|
|
return 0;
|
|
|
|
/*
|
|
* Use the regular setattr path to update the timestamps.
|
|
*/
|
|
iattr->ia_valid &= ~ATTR_SIZE;
|
|
return xfs_setattr_nonsize(ip, iattr, 0);
|
|
}
|
|
|
|
/*
|
|
* Make sure that the dquots are attached to the inode.
|
|
*/
|
|
error = xfs_qm_dqattach(ip, 0);
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* Wait for all direct I/O to complete.
|
|
*/
|
|
inode_dio_wait(inode);
|
|
|
|
/*
|
|
* File data changes must be complete before we start the transaction to
|
|
* modify the inode. This needs to be done before joining the inode to
|
|
* the transaction because the inode cannot be unlocked once it is a
|
|
* part of the transaction.
|
|
*
|
|
* Start with zeroing any data beyond EOF that we may expose on file
|
|
* extension, or zeroing out the rest of the block on a downward
|
|
* truncate.
|
|
*/
|
|
if (newsize > oldsize) {
|
|
error = xfs_zero_eof(ip, newsize, oldsize, &did_zeroing);
|
|
} else {
|
|
error = iomap_truncate_page(inode, newsize, &did_zeroing,
|
|
&xfs_iomap_ops);
|
|
}
|
|
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* We are going to log the inode size change in this transaction so
|
|
* any previous writes that are beyond the on disk EOF and the new
|
|
* EOF that have not been written out need to be written here. If we
|
|
* do not write the data out, we expose ourselves to the null files
|
|
* problem. Note that this includes any block zeroing we did above;
|
|
* otherwise those blocks may not be zeroed after a crash.
|
|
*/
|
|
if (did_zeroing ||
|
|
(newsize > ip->i_d.di_size && oldsize != ip->i_d.di_size)) {
|
|
error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
|
|
ip->i_d.di_size, newsize);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* We've already locked out new page faults, so now we can safely remove
|
|
* pages from the page cache knowing they won't get refaulted until we
|
|
* drop the XFS_MMAP_EXCL lock after the extent manipulations are
|
|
* complete. The truncate_setsize() call also cleans partial EOF page
|
|
* PTEs on extending truncates and hence ensures sub-page block size
|
|
* filesystems are correctly handled, too.
|
|
*
|
|
* We have to do all the page cache truncate work outside the
|
|
* transaction context as the "lock" order is page lock->log space
|
|
* reservation as defined by extent allocation in the writeback path.
|
|
* Hence a truncate can fail with ENOMEM from xfs_trans_alloc(), but
|
|
* having already truncated the in-memory version of the file (i.e. made
|
|
* user visible changes). There's not much we can do about this, except
|
|
* to hope that the caller sees ENOMEM and retries the truncate
|
|
* operation.
|
|
*/
|
|
truncate_setsize(inode, newsize);
|
|
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
|
|
if (error)
|
|
return error;
|
|
|
|
lock_flags |= XFS_ILOCK_EXCL;
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ijoin(tp, ip, 0);
|
|
|
|
/*
|
|
* Only change the c/mtime if we are changing the size or we are
|
|
* explicitly asked to change it. This handles the semantic difference
|
|
* between truncate() and ftruncate() as implemented in the VFS.
|
|
*
|
|
* The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
|
|
* special case where we need to update the times despite not having
|
|
* these flags set. For all other operations the VFS set these flags
|
|
* explicitly if it wants a timestamp update.
|
|
*/
|
|
if (newsize != oldsize &&
|
|
!(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
|
|
iattr->ia_ctime = iattr->ia_mtime =
|
|
current_time(inode);
|
|
iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
|
|
}
|
|
|
|
/*
|
|
* The first thing we do is set the size to new_size permanently on
|
|
* disk. This way we don't have to worry about anyone ever being able
|
|
* to look at the data being freed even in the face of a crash.
|
|
* What we're getting around here is the case where we free a block, it
|
|
* is allocated to another file, it is written to, and then we crash.
|
|
* If the new data gets written to the file but the log buffers
|
|
* containing the free and reallocation don't, then we'd end up with
|
|
* garbage in the blocks being freed. As long as we make the new size
|
|
* permanent before actually freeing any blocks it doesn't matter if
|
|
* they get written to.
|
|
*/
|
|
ip->i_d.di_size = newsize;
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
|
|
|
if (newsize <= oldsize) {
|
|
error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
|
|
/*
|
|
* Truncated "down", so we're removing references to old data
|
|
* here - if we delay flushing for a long time, we expose
|
|
* ourselves unduly to the notorious NULL files problem. So,
|
|
* we mark this inode and flush it when the file is closed,
|
|
* and do not wait the usual (long) time for writeout.
|
|
*/
|
|
xfs_iflags_set(ip, XFS_ITRUNCATED);
|
|
|
|
/* A truncate down always removes post-EOF blocks. */
|
|
xfs_inode_clear_eofblocks_tag(ip);
|
|
}
|
|
|
|
if (iattr->ia_valid & ATTR_MODE)
|
|
xfs_setattr_mode(ip, iattr);
|
|
if (iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
|
|
xfs_setattr_time(ip, iattr);
|
|
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
|
|
|
XFS_STATS_INC(mp, xs_ig_attrchg);
|
|
|
|
if (mp->m_flags & XFS_MOUNT_WSYNC)
|
|
xfs_trans_set_sync(tp);
|
|
|
|
error = xfs_trans_commit(tp);
|
|
out_unlock:
|
|
if (lock_flags)
|
|
xfs_iunlock(ip, lock_flags);
|
|
return error;
|
|
|
|
out_trans_cancel:
|
|
xfs_trans_cancel(tp);
|
|
goto out_unlock;
|
|
}
|
|
|
|
int
|
|
xfs_vn_setattr_size(
|
|
struct dentry *dentry,
|
|
struct iattr *iattr)
|
|
{
|
|
struct xfs_inode *ip = XFS_I(d_inode(dentry));
|
|
int error;
|
|
|
|
trace_xfs_setattr(ip);
|
|
|
|
error = xfs_vn_change_ok(dentry, iattr);
|
|
if (error)
|
|
return error;
|
|
return xfs_setattr_size(ip, iattr);
|
|
}
|
|
|
|
STATIC int
|
|
xfs_vn_setattr(
|
|
struct dentry *dentry,
|
|
struct iattr *iattr)
|
|
{
|
|
int error;
|
|
|
|
if (iattr->ia_valid & ATTR_SIZE) {
|
|
struct xfs_inode *ip = XFS_I(d_inode(dentry));
|
|
uint iolock = XFS_IOLOCK_EXCL;
|
|
|
|
error = xfs_break_layouts(d_inode(dentry), &iolock);
|
|
if (error)
|
|
return error;
|
|
|
|
xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
|
|
error = xfs_vn_setattr_size(dentry, iattr);
|
|
xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
|
|
} else {
|
|
error = xfs_vn_setattr_nonsize(dentry, iattr);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_vn_update_time(
|
|
struct inode *inode,
|
|
struct timespec *now,
|
|
int flags)
|
|
{
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct xfs_trans *tp;
|
|
int error;
|
|
|
|
trace_xfs_update_time(ip);
|
|
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
|
|
if (error)
|
|
return error;
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
if (flags & S_CTIME)
|
|
inode->i_ctime = *now;
|
|
if (flags & S_MTIME)
|
|
inode->i_mtime = *now;
|
|
if (flags & S_ATIME)
|
|
inode->i_atime = *now;
|
|
|
|
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
|
|
return xfs_trans_commit(tp);
|
|
}
|
|
|
|
STATIC int
|
|
xfs_vn_fiemap(
|
|
struct inode *inode,
|
|
struct fiemap_extent_info *fieinfo,
|
|
u64 start,
|
|
u64 length)
|
|
{
|
|
int error;
|
|
|
|
xfs_ilock(XFS_I(inode), XFS_IOLOCK_SHARED);
|
|
if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
|
|
fieinfo->fi_flags &= ~FIEMAP_FLAG_XATTR;
|
|
error = iomap_fiemap(inode, fieinfo, start, length,
|
|
&xfs_xattr_iomap_ops);
|
|
} else {
|
|
error = iomap_fiemap(inode, fieinfo, start, length,
|
|
&xfs_iomap_ops);
|
|
}
|
|
xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);
|
|
|
|
return error;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_vn_tmpfile(
|
|
struct inode *dir,
|
|
struct dentry *dentry,
|
|
umode_t mode)
|
|
{
|
|
return xfs_generic_create(dir, dentry, mode, 0, true);
|
|
}
|
|
|
|
static const struct inode_operations xfs_inode_operations = {
|
|
.get_acl = xfs_get_acl,
|
|
.set_acl = xfs_set_acl,
|
|
.getattr = xfs_vn_getattr,
|
|
.setattr = xfs_vn_setattr,
|
|
.listxattr = xfs_vn_listxattr,
|
|
.fiemap = xfs_vn_fiemap,
|
|
.update_time = xfs_vn_update_time,
|
|
};
|
|
|
|
static const struct inode_operations xfs_dir_inode_operations = {
|
|
.create = xfs_vn_create,
|
|
.lookup = xfs_vn_lookup,
|
|
.link = xfs_vn_link,
|
|
.unlink = xfs_vn_unlink,
|
|
.symlink = xfs_vn_symlink,
|
|
.mkdir = xfs_vn_mkdir,
|
|
/*
|
|
* Yes, XFS uses the same method for rmdir and unlink.
|
|
*
|
|
* There are some subtile differences deeper in the code,
|
|
* but we use S_ISDIR to check for those.
|
|
*/
|
|
.rmdir = xfs_vn_unlink,
|
|
.mknod = xfs_vn_mknod,
|
|
.rename = xfs_vn_rename,
|
|
.get_acl = xfs_get_acl,
|
|
.set_acl = xfs_set_acl,
|
|
.getattr = xfs_vn_getattr,
|
|
.setattr = xfs_vn_setattr,
|
|
.listxattr = xfs_vn_listxattr,
|
|
.update_time = xfs_vn_update_time,
|
|
.tmpfile = xfs_vn_tmpfile,
|
|
};
|
|
|
|
static const struct inode_operations xfs_dir_ci_inode_operations = {
|
|
.create = xfs_vn_create,
|
|
.lookup = xfs_vn_ci_lookup,
|
|
.link = xfs_vn_link,
|
|
.unlink = xfs_vn_unlink,
|
|
.symlink = xfs_vn_symlink,
|
|
.mkdir = xfs_vn_mkdir,
|
|
/*
|
|
* Yes, XFS uses the same method for rmdir and unlink.
|
|
*
|
|
* There are some subtile differences deeper in the code,
|
|
* but we use S_ISDIR to check for those.
|
|
*/
|
|
.rmdir = xfs_vn_unlink,
|
|
.mknod = xfs_vn_mknod,
|
|
.rename = xfs_vn_rename,
|
|
.get_acl = xfs_get_acl,
|
|
.set_acl = xfs_set_acl,
|
|
.getattr = xfs_vn_getattr,
|
|
.setattr = xfs_vn_setattr,
|
|
.listxattr = xfs_vn_listxattr,
|
|
.update_time = xfs_vn_update_time,
|
|
.tmpfile = xfs_vn_tmpfile,
|
|
};
|
|
|
|
static const struct inode_operations xfs_symlink_inode_operations = {
|
|
.get_link = xfs_vn_get_link,
|
|
.getattr = xfs_vn_getattr,
|
|
.setattr = xfs_vn_setattr,
|
|
.listxattr = xfs_vn_listxattr,
|
|
.update_time = xfs_vn_update_time,
|
|
};
|
|
|
|
static const struct inode_operations xfs_inline_symlink_inode_operations = {
|
|
.get_link = xfs_vn_get_link_inline,
|
|
.getattr = xfs_vn_getattr,
|
|
.setattr = xfs_vn_setattr,
|
|
.listxattr = xfs_vn_listxattr,
|
|
.update_time = xfs_vn_update_time,
|
|
};
|
|
|
|
STATIC void
|
|
xfs_diflags_to_iflags(
|
|
struct inode *inode,
|
|
struct xfs_inode *ip)
|
|
{
|
|
uint16_t flags = ip->i_d.di_flags;
|
|
|
|
inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC |
|
|
S_NOATIME | S_DAX);
|
|
|
|
if (flags & XFS_DIFLAG_IMMUTABLE)
|
|
inode->i_flags |= S_IMMUTABLE;
|
|
if (flags & XFS_DIFLAG_APPEND)
|
|
inode->i_flags |= S_APPEND;
|
|
if (flags & XFS_DIFLAG_SYNC)
|
|
inode->i_flags |= S_SYNC;
|
|
if (flags & XFS_DIFLAG_NOATIME)
|
|
inode->i_flags |= S_NOATIME;
|
|
if (S_ISREG(inode->i_mode) &&
|
|
ip->i_mount->m_sb.sb_blocksize == PAGE_SIZE &&
|
|
!xfs_is_reflink_inode(ip) &&
|
|
(ip->i_mount->m_flags & XFS_MOUNT_DAX ||
|
|
ip->i_d.di_flags2 & XFS_DIFLAG2_DAX))
|
|
inode->i_flags |= S_DAX;
|
|
}
|
|
|
|
/*
|
|
* Initialize the Linux inode.
|
|
*
|
|
* When reading existing inodes from disk this is called directly from xfs_iget,
|
|
* when creating a new inode it is called from xfs_ialloc after setting up the
|
|
* inode. These callers have different criteria for clearing XFS_INEW, so leave
|
|
* it up to the caller to deal with unlocking the inode appropriately.
|
|
*/
|
|
void
|
|
xfs_setup_inode(
|
|
struct xfs_inode *ip)
|
|
{
|
|
struct inode *inode = &ip->i_vnode;
|
|
gfp_t gfp_mask;
|
|
|
|
inode->i_ino = ip->i_ino;
|
|
inode->i_state = I_NEW;
|
|
|
|
inode_sb_list_add(inode);
|
|
/* make the inode look hashed for the writeback code */
|
|
hlist_add_fake(&inode->i_hash);
|
|
|
|
inode->i_uid = xfs_uid_to_kuid(ip->i_d.di_uid);
|
|
inode->i_gid = xfs_gid_to_kgid(ip->i_d.di_gid);
|
|
|
|
switch (inode->i_mode & S_IFMT) {
|
|
case S_IFBLK:
|
|
case S_IFCHR:
|
|
inode->i_rdev =
|
|
MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
|
|
sysv_minor(ip->i_df.if_u2.if_rdev));
|
|
break;
|
|
default:
|
|
inode->i_rdev = 0;
|
|
break;
|
|
}
|
|
|
|
i_size_write(inode, ip->i_d.di_size);
|
|
xfs_diflags_to_iflags(inode, ip);
|
|
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
|
|
ip->d_ops = ip->i_mount->m_dir_inode_ops;
|
|
} else {
|
|
ip->d_ops = ip->i_mount->m_nondir_inode_ops;
|
|
lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
|
|
}
|
|
|
|
/*
|
|
* Ensure all page cache allocations are done from GFP_NOFS context to
|
|
* prevent direct reclaim recursion back into the filesystem and blowing
|
|
* stacks or deadlocking.
|
|
*/
|
|
gfp_mask = mapping_gfp_mask(inode->i_mapping);
|
|
mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
|
|
|
|
/*
|
|
* If there is no attribute fork no ACL can exist on this inode,
|
|
* and it can't have any file capabilities attached to it either.
|
|
*/
|
|
if (!XFS_IFORK_Q(ip)) {
|
|
inode_has_no_xattr(inode);
|
|
cache_no_acl(inode);
|
|
}
|
|
}
|
|
|
|
void
|
|
xfs_setup_iops(
|
|
struct xfs_inode *ip)
|
|
{
|
|
struct inode *inode = &ip->i_vnode;
|
|
|
|
switch (inode->i_mode & S_IFMT) {
|
|
case S_IFREG:
|
|
inode->i_op = &xfs_inode_operations;
|
|
inode->i_fop = &xfs_file_operations;
|
|
inode->i_mapping->a_ops = &xfs_address_space_operations;
|
|
break;
|
|
case S_IFDIR:
|
|
if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb))
|
|
inode->i_op = &xfs_dir_ci_inode_operations;
|
|
else
|
|
inode->i_op = &xfs_dir_inode_operations;
|
|
inode->i_fop = &xfs_dir_file_operations;
|
|
break;
|
|
case S_IFLNK:
|
|
if (ip->i_df.if_flags & XFS_IFINLINE)
|
|
inode->i_op = &xfs_inline_symlink_inode_operations;
|
|
else
|
|
inode->i_op = &xfs_symlink_inode_operations;
|
|
break;
|
|
default:
|
|
inode->i_op = &xfs_inode_operations;
|
|
init_special_inode(inode, inode->i_mode, inode->i_rdev);
|
|
break;
|
|
}
|
|
}
|