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cifs: enable fscache usage even for files opened as rw

Browse source 
So far, the fscache implementation we had supports only
a small set of use cases. Particularly for files opened
with O_RDONLY.

This commit enables it even for rw based file opens. It
also enables the reuse of cached data in case of mount
option (cache=singleclient) where it is guaranteed that
this is the only client (and server) which operates on
the files. There's also a single line change in fscache.c
to get around a bug seen in fscache.

Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Acked-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Shyam Prasad N 2021-08-10 10:22:28 +00:00 committed by Steve French
parent 3d2b50e0e7
commit 18d04062f8
6 changed files with 76 additions and 11 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
fs/cifs/cifsfs.c
View file

@ -399,7 +399,6 @@ cifs_evict_inode(struct inode *inode)
{
truncate_inode_pages_final(&inode->i_data);
clear_inode(inode);
cifs_fscache_release_inode_cookie(inode);
}
static void

1
fs/cifs/cifssmb.c
View file

@ -2101,6 +2101,7 @@ cifs_writev_complete(struct work_struct *work)
else if (wdata->result < 0)
SetPageError(page);
end_page_writeback(page);
cifs_readpage_to_fscache(inode, page);
put_page(page);
}
if (wdata->result != -EAGAIN)

15
fs/cifs/file.c
View file

@ -377,6 +377,8 @@ static void cifsFileInfo_put_final(struct cifsFileInfo *cifs_file)
struct cifsLockInfo *li, *tmp;
struct super_block *sb = inode->i_sb;
cifs_fscache_release_inode_cookie(inode);
/*
* Delete any outstanding lock records. We'll lose them when the file
* is closed anyway.
@ -882,8 +884,10 @@ int cifs_close(struct inode *inode, struct file *file)
if ((cinode->oplock == CIFS_CACHE_RHW_FLG) &&
cinode->lease_granted &&
dclose) {
if (test_bit(CIFS_INO_MODIFIED_ATTR, &cinode->flags))
if (test_bit(CIFS_INO_MODIFIED_ATTR, &cinode->flags)) {
inode->i_ctime = inode->i_mtime = current_time(inode);
cifs_fscache_update_inode_cookie(inode);
}
spin_lock(&cinode->deferred_lock);
cifs_add_deferred_close(cfile, dclose);
if (cfile->deferred_close_scheduled &&
@ -4170,6 +4174,10 @@ static vm_fault_t
cifs_page_mkwrite(struct vm_fault *vmf)
{
struct page *page = vmf->page;
struct file *file = vmf->vma->vm_file;
struct inode *inode = file_inode(file);
cifs_fscache_wait_on_page_write(inode, page);
lock_page(page);
return VM_FAULT_LOCKED;
@ -4235,13 +4243,16 @@ cifs_readv_complete(struct work_struct *work)
(rdata->result == -EAGAIN && got_bytes)) {
flush_dcache_page(page);
SetPageUptodate(page);
}
} else
SetPageError(page);
unlock_page(page);
if (rdata->result == 0 ||
(rdata->result == -EAGAIN && got_bytes))
cifs_readpage_to_fscache(rdata->mapping->host, page);
else
cifs_fscache_uncache_page(rdata->mapping->host, page);
got_bytes -= min_t(unsigned int, PAGE_SIZE, got_bytes);

41
fs/cifs/fscache.c
View file

@ -176,29 +176,34 @@ void cifs_fscache_release_inode_cookie(struct inode *inode)
auxdata.last_change_time_nsec = cifsi->vfs_inode.i_ctime.tv_nsec;
cifs_dbg(FYI, "%s: (0x%p)\n", __func__, cifsi->fscache);
/* fscache_relinquish_cookie does not seem to update auxdata */
fscache_update_cookie(cifsi->fscache, &auxdata);
fscache_relinquish_cookie(cifsi->fscache, &auxdata, false);
cifsi->fscache = NULL;
}
}
static void cifs_fscache_disable_inode_cookie(struct inode *inode)
void cifs_fscache_update_inode_cookie(struct inode *inode)
{
struct cifs_fscache_inode_auxdata auxdata;
struct cifsInodeInfo *cifsi = CIFS_I(inode);
if (cifsi->fscache) {
memset(&auxdata, 0, sizeof(auxdata));
auxdata.eof = cifsi->server_eof;
auxdata.last_write_time_sec = cifsi->vfs_inode.i_mtime.tv_sec;
auxdata.last_change_time_sec = cifsi->vfs_inode.i_ctime.tv_sec;
auxdata.last_write_time_nsec = cifsi->vfs_inode.i_mtime.tv_nsec;
auxdata.last_change_time_nsec = cifsi->vfs_inode.i_ctime.tv_nsec;
cifs_dbg(FYI, "%s: (0x%p)\n", __func__, cifsi->fscache);
fscache_uncache_all_inode_pages(cifsi->fscache, inode);
fscache_relinquish_cookie(cifsi->fscache, NULL, true);
cifsi->fscache = NULL;
fscache_update_cookie(cifsi->fscache, &auxdata);
}
}
void cifs_fscache_set_inode_cookie(struct inode *inode, struct file *filp)
{
if ((filp->f_flags & O_ACCMODE) != O_RDONLY)
cifs_fscache_disable_inode_cookie(inode);
else
cifs_fscache_enable_inode_cookie(inode);
cifs_fscache_enable_inode_cookie(inode);
}
void cifs_fscache_reset_inode_cookie(struct inode *inode)
@ -310,6 +315,8 @@ void __cifs_readpage_to_fscache(struct inode *inode, struct page *page)
struct cifsInodeInfo *cifsi = CIFS_I(inode);
int ret;
WARN_ON(!cifsi->fscache);
cifs_dbg(FYI, "%s: (fsc: %p, p: %p, i: %p)\n",
__func__, cifsi->fscache, page, inode);
ret = fscache_write_page(cifsi->fscache, page,
@ -334,3 +341,21 @@ void __cifs_fscache_invalidate_page(struct page *page, struct inode *inode)
fscache_wait_on_page_write(cookie, page);
fscache_uncache_page(cookie, page);
}
void __cifs_fscache_wait_on_page_write(struct inode *inode, struct page *page)
{
struct cifsInodeInfo *cifsi = CIFS_I(inode);
struct fscache_cookie *cookie = cifsi->fscache;
cifs_dbg(FYI, "%s: (0x%p/0x%p)\n", __func__, page, cookie);
fscache_wait_on_page_write(cookie, page);
}
void __cifs_fscache_uncache_page(struct inode *inode, struct page *page)
{
struct cifsInodeInfo *cifsi = CIFS_I(inode);
struct fscache_cookie *cookie = cifsi->fscache;
cifs_dbg(FYI, "%s: (0x%p/0x%p)\n", __func__, page, cookie);
fscache_uncache_page(cookie, page);
}

23
fs/cifs/fscache.h
View file

@ -55,10 +55,13 @@ extern void cifs_fscache_get_super_cookie(struct cifs_tcon *);
extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);
extern void cifs_fscache_release_inode_cookie(struct inode *);
extern void cifs_fscache_update_inode_cookie(struct inode *inode);
extern void cifs_fscache_set_inode_cookie(struct inode *, struct file *);
extern void cifs_fscache_reset_inode_cookie(struct inode *);
extern void __cifs_fscache_invalidate_page(struct page *, struct inode *);
extern void __cifs_fscache_wait_on_page_write(struct inode *inode, struct page *page);
extern void __cifs_fscache_uncache_page(struct inode *inode, struct page *page);
extern int cifs_fscache_release_page(struct page *page, gfp_t gfp);
extern int __cifs_readpage_from_fscache(struct inode *, struct page *);
extern int __cifs_readpages_from_fscache(struct inode *,
@ -76,6 +79,20 @@ static inline void cifs_fscache_invalidate_page(struct page *page,
__cifs_fscache_invalidate_page(page, inode);
}
static inline void cifs_fscache_wait_on_page_write(struct inode *inode,
struct page *page)
{
if (PageFsCache(page))
__cifs_fscache_wait_on_page_write(inode, page);
}
static inline void cifs_fscache_uncache_page(struct inode *inode,
struct page *page)
{
if (PageFsCache(page))
__cifs_fscache_uncache_page(inode, page);
}
static inline int cifs_readpage_from_fscache(struct inode *inode,
struct page *page)
{
@ -123,6 +140,7 @@ static inline void
cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
static inline void cifs_fscache_update_inode_cookie(struct inode *inode) {}
static inline void cifs_fscache_set_inode_cookie(struct inode *inode,
struct file *filp) {}
static inline void cifs_fscache_reset_inode_cookie(struct inode *inode) {}
@ -133,6 +151,11 @@ static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp)
static inline void cifs_fscache_invalidate_page(struct page *page,
struct inode *inode) {}
static inline void cifs_fscache_wait_on_page_write(struct inode *inode,
struct page *page) {}
static inline void cifs_fscache_uncache_page(struct inode *inode,
struct page *page) {}
static inline int
cifs_readpage_from_fscache(struct inode *inode, struct page *page)
{

6
fs/cifs/inode.c
View file

@ -2297,6 +2297,7 @@ cifs_revalidate_mapping(struct inode *inode)
{
int rc;
unsigned long *flags = &CIFS_I(inode)->flags;
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
/* swapfiles are not supposed to be shared */
if (IS_SWAPFILE(inode))
@ -2308,11 +2309,16 @@ cifs_revalidate_mapping(struct inode *inode)
return rc;
if (test_and_clear_bit(CIFS_INO_INVALID_MAPPING, flags)) {
/* for cache=singleclient, do not invalidate */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
goto skip_invalidate;
rc = cifs_invalidate_mapping(inode);
if (rc)
set_bit(CIFS_INO_INVALID_MAPPING, flags);
}
skip_invalidate:
clear_bit_unlock(CIFS_INO_LOCK, flags);
smp_mb__after_atomic();
wake_up_bit(flags, CIFS_INO_LOCK);