| Message ID | 20240328165845.2782259-12-dhowells@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | netfs, cifs: Delegate high-level I/O to netfslib | expand |
> -----Original Message----- > From: David Howells <dhowells@redhat.com> > Sent: Thursday, March 28, 2024 10:28 PM > To: Steve French <smfrench@gmail.com> > Cc: David Howells <dhowells@redhat.com>; Jeff Layton <jlayton@kernel.org>; > Matthew Wilcox <willy@infradead.org>; Paulo Alcantara <pc@manguebit.com>; > Shyam Prasad N <sprasad@microsoft.com>; Tom Talpey <tom@talpey.com>; > Christian Brauner <christian@brauner.io>; netfs@lists.linux.dev; linux- > cifs@vger.kernel.org; linux-fsdevel@vger.kernel.org; linux-mm@kvack.org; > netdev@vger.kernel.org; linux-kernel@vger.kernel.org; Steve French > <sfrench@samba.org>; Shyam Prasad N <nspmangalore@gmail.com>; Rohith > Surabattula <rohiths.msft@gmail.com> > Subject: [PATCH v6 11/15] cifs: When caching, try to open > O_WRONLY file rdwr on server > > When we're engaged in local caching of a cifs filesystem, we cannot perform > caching of a partially written cache granule unless we can read the rest of the > granule. To deal with this, if a file is opened O_WRONLY locally, but the mount > was given the "-o fsc" flag, try first opening the remote file with > GENERIC_READ|GENERIC_WRITE and if that returns -EACCES, try dropping > the GENERIC_READ and doing the open again. If that last succeeds, invalidate > the cache for that file as for O_DIRECT. > > Signed-off-by: David Howells <dhowells@redhat.com> > cc: Steve French <sfrench@samba.org> > cc: Shyam Prasad N <nspmangalore@gmail.com> > cc: Rohith Surabattula <rohiths.msft@gmail.com> > cc: Jeff Layton <jlayton@kernel.org> > cc: linux-cifs@vger.kernel.org > cc: netfs@lists.linux.dev > cc: linux-fsdevel@vger.kernel.org > cc: linux-mm@kvack.org > --- > fs/smb/client/dir.c | 15 ++++++++++++ > fs/smb/client/file.c | 51 +++++++++++++++++++++++++++++++++-------- > fs/smb/client/fscache.h | 6 +++++ > 3 files changed, 62 insertions(+), 10 deletions(-) > > diff --git a/fs/smb/client/dir.c b/fs/smb/client/dir.c index > 89333d9bce36..37897b919dd5 100644 > --- a/fs/smb/client/dir.c > +++ b/fs/smb/client/dir.c > @@ -189,6 +189,7 @@ static int cifs_do_create(struct inode *inode, struct dentry > *direntry, unsigned > int disposition; > struct TCP_Server_Info *server = tcon->ses->server; > struct cifs_open_parms oparms; > + int rdwr_for_fscache = 0; > > *oplock = 0; > if (tcon->ses->server->oplocks) > @@ -200,6 +201,10 @@ static int cifs_do_create(struct inode *inode, struct > dentry *direntry, unsigned > return PTR_ERR(full_path); > } > > + /* If we're caching, we need to be able to fill in around partial writes. */ > + if (cifs_fscache_enabled(inode) && (oflags & O_ACCMODE) == > O_WRONLY) > + rdwr_for_fscache = 1; > + > #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY > if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open > && > (CIFS_UNIX_POSIX_PATH_OPS_CAP & > @@ -276,6 +281,8 @@ static int cifs_do_create(struct inode *inode, struct dentry > *direntry, unsigned > desired_access |= GENERIC_READ; /* is this too little? */ > if (OPEN_FMODE(oflags) & FMODE_WRITE) > desired_access |= GENERIC_WRITE; > + if (rdwr_for_fscache == 1) > + desired_access |= GENERIC_READ; > > disposition = FILE_OVERWRITE_IF; > if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) @@ - > 304,6 +311,7 @@ static int cifs_do_create(struct inode *inode, struct dentry > *direntry, unsigned > if (!tcon->unix_ext && (mode & S_IWUGO) == 0) > create_options |= CREATE_OPTION_READONLY; > > +retry_open: > oparms = (struct cifs_open_parms) { > .tcon = tcon, > .cifs_sb = cifs_sb, > @@ -317,8 +325,15 @@ static int cifs_do_create(struct inode *inode, struct > dentry *direntry, unsigned > rc = server->ops->open(xid, &oparms, oplock, buf); > if (rc) { > cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc); > + if (rc == -EACCES && rdwr_for_fscache == 1) { > + desired_access &= ~GENERIC_READ; > + rdwr_for_fscache = 2; > + goto retry_open; > + } > goto out; > } > + if (rdwr_for_fscache == 2) > + cifs_invalidate_cache(inode, FSCACHE_INVAL_DIO_WRITE); > > #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY > /* > diff --git a/fs/smb/client/file.c b/fs/smb/client/file.c index > 73573dadf90e..761a80963f76 100644 > --- a/fs/smb/client/file.c > +++ b/fs/smb/client/file.c > @@ -521,12 +521,12 @@ cifs_mark_open_files_invalid(struct cifs_tcon *tcon) > */ > } > > -static inline int cifs_convert_flags(unsigned int flags) > +static inline int cifs_convert_flags(unsigned int flags, int > +rdwr_for_fscache) > { > if ((flags & O_ACCMODE) == O_RDONLY) > return GENERIC_READ; > else if ((flags & O_ACCMODE) == O_WRONLY) > - return GENERIC_WRITE; > + return rdwr_for_fscache == 1 ? (GENERIC_READ | > GENERIC_WRITE) : > +GENERIC_WRITE; > else if ((flags & O_ACCMODE) == O_RDWR) { > /* GENERIC_ALL is too much permission to request > can cause unnecessary access denied on create */ @@ - > 663,11 +663,16 @@ static int cifs_nt_open(const char *full_path, struct inode > *inode, struct cifs_ > int create_options = CREATE_NOT_DIR; > struct TCP_Server_Info *server = tcon->ses->server; > struct cifs_open_parms oparms; > + int rdwr_for_fscache = 0; > > if (!server->ops->open) > return -ENOSYS; > > - desired_access = cifs_convert_flags(f_flags); > + /* If we're caching, we need to be able to fill in around partial writes. */ > + if (cifs_fscache_enabled(inode) && (f_flags & O_ACCMODE) == > O_WRONLY) > + rdwr_for_fscache = 1; > + > + desired_access = cifs_convert_flags(f_flags, rdwr_for_fscache); > > /********************************************************************* > * open flag mapping table: > @@ -704,6 +709,7 @@ static int cifs_nt_open(const char *full_path, struct inode > *inode, struct cifs_ > if (f_flags & O_DIRECT) > create_options |= CREATE_NO_BUFFER; > > +retry_open: > oparms = (struct cifs_open_parms) { > .tcon = tcon, > .cifs_sb = cifs_sb, > @@ -715,8 +721,16 @@ static int cifs_nt_open(const char *full_path, struct inode > *inode, struct cifs_ > }; > > rc = server->ops->open(xid, &oparms, oplock, buf); > - if (rc) > + if (rc) { > + if (rc == -EACCES && rdwr_for_fscache == 1) { > + desired_access = cifs_convert_flags(f_flags, 0); > + rdwr_for_fscache = 2; > + goto retry_open; > + } > return rc; > + } > + if (rdwr_for_fscache == 2) > + cifs_invalidate_cache(inode, FSCACHE_INVAL_DIO_WRITE); > > /* TODO: Add support for calling posix query info but with passing in fid */ > if (tcon->unix_ext) > @@ -1149,11 +1163,14 @@ int cifs_open(struct inode *inode, struct file *file) > use_cache: > fscache_use_cookie(cifs_inode_cookie(file_inode(file)), > file->f_mode & FMODE_WRITE); > - if (file->f_flags & O_DIRECT && > - (!((file->f_flags & O_ACCMODE) != O_RDONLY) || > - file->f_flags & O_APPEND)) > - cifs_invalidate_cache(file_inode(file), > - FSCACHE_INVAL_DIO_WRITE); > + //if ((file->f_flags & O_ACCMODE) == O_WRONLY) > + // goto inval; Why to keep unused code? Thanks, Naveen > + if (!(file->f_flags & O_DIRECT)) > + goto out; > + if ((file->f_flags & (O_ACCMODE | O_APPEND)) == O_RDONLY) > + goto out; > +//inval: > + cifs_invalidate_cache(file_inode(file), FSCACHE_INVAL_DIO_WRITE); > > out: > free_dentry_path(page); > @@ -1218,6 +1235,7 @@ cifs_reopen_file(struct cifsFileInfo *cfile, bool > can_flush) > int disposition = FILE_OPEN; > int create_options = CREATE_NOT_DIR; > struct cifs_open_parms oparms; > + int rdwr_for_fscache = 0; > > xid = get_xid(); > mutex_lock(&cfile->fh_mutex); > @@ -1281,7 +1299,11 @@ cifs_reopen_file(struct cifsFileInfo *cfile, bool > can_flush) > } > #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ > > - desired_access = cifs_convert_flags(cfile->f_flags); > + /* If we're caching, we need to be able to fill in around partial writes. */ > + if (cifs_fscache_enabled(inode) && (cfile->f_flags & O_ACCMODE) == > O_WRONLY) > + rdwr_for_fscache = 1; > + > + desired_access = cifs_convert_flags(cfile->f_flags, rdwr_for_fscache); > > /* O_SYNC also has bit for O_DSYNC so following check picks up either > */ > if (cfile->f_flags & O_SYNC) > @@ -1293,6 +1315,7 @@ cifs_reopen_file(struct cifsFileInfo *cfile, bool > can_flush) > if (server->ops->get_lease_key) > server->ops->get_lease_key(inode, &cfile->fid); > > +retry_open: > oparms = (struct cifs_open_parms) { > .tcon = tcon, > .cifs_sb = cifs_sb, > @@ -1318,6 +1341,11 @@ cifs_reopen_file(struct cifsFileInfo *cfile, bool > can_flush) > /* indicate that we need to relock the file */ > oparms.reconnect = true; > } > + if (rc == -EACCES && rdwr_for_fscache == 1) { > + desired_access = cifs_convert_flags(cfile->f_flags, 0); > + rdwr_for_fscache = 2; > + goto retry_open; > + } > > if (rc) { > mutex_unlock(&cfile->fh_mutex); > @@ -1326,6 +1354,9 @@ cifs_reopen_file(struct cifsFileInfo *cfile, bool > can_flush) > goto reopen_error_exit; > } > > + if (rdwr_for_fscache == 2) > + cifs_invalidate_cache(inode, FSCACHE_INVAL_DIO_WRITE); > + > #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY > reopen_success: > #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ diff --git > a/fs/smb/client/fscache.h b/fs/smb/client/fscache.h index > a3d73720914f..1f2ea9f5cc9a 100644 > --- a/fs/smb/client/fscache.h > +++ b/fs/smb/client/fscache.h > @@ -109,6 +109,11 @@ static inline void cifs_readahead_to_fscache(struct > inode *inode, > __cifs_readahead_to_fscache(inode, pos, len); } > > +static inline bool cifs_fscache_enabled(struct inode *inode) { > + return fscache_cookie_enabled(cifs_inode_cookie(inode)); > +} > + > #else /* CONFIG_CIFS_FSCACHE */ > static inline > void cifs_fscache_fill_coherency(struct inode *inode, @@ -124,6 +129,7 @@ > static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {} static > inline void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update) {} > static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode) { return > NULL; } static inline void cifs_invalidate_cache(struct inode *inode, unsigned int > flags) {} > +static inline bool cifs_fscache_enabled(struct inode *inode) { return > +false; } > > static inline int cifs_fscache_query_occupancy(struct inode *inode, > pgoff_t first, unsigned int nr_pages, >
diff --git a/fs/smb/client/dir.c b/fs/smb/client/dir.c index 89333d9bce36..37897b919dd5 100644 --- a/fs/smb/client/dir.c +++ b/fs/smb/client/dir.c @@ -189,6 +189,7 @@ static int cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int disposition; struct TCP_Server_Info *server = tcon->ses->server; struct cifs_open_parms oparms; + int rdwr_for_fscache = 0; *oplock = 0; if (tcon->ses->server->oplocks) @@ -200,6 +201,10 @@ static int cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned return PTR_ERR(full_path); } + /* If we're caching, we need to be able to fill in around partial writes. */ + if (cifs_fscache_enabled(inode) && (oflags & O_ACCMODE) == O_WRONLY) + rdwr_for_fscache = 1; + #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open && (CIFS_UNIX_POSIX_PATH_OPS_CAP & @@ -276,6 +281,8 @@ static int cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned desired_access |= GENERIC_READ; /* is this too little? */ if (OPEN_FMODE(oflags) & FMODE_WRITE) desired_access |= GENERIC_WRITE; + if (rdwr_for_fscache == 1) + desired_access |= GENERIC_READ; disposition = FILE_OVERWRITE_IF; if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) @@ -304,6 +311,7 @@ static int cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned if (!tcon->unix_ext && (mode & S_IWUGO) == 0) create_options |= CREATE_OPTION_READONLY; +retry_open: oparms = (struct cifs_open_parms) { .tcon = tcon, .cifs_sb = cifs_sb, @@ -317,8 +325,15 @@ static int cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned rc = server->ops->open(xid, &oparms, oplock, buf); if (rc) { cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc); + if (rc == -EACCES && rdwr_for_fscache == 1) { + desired_access &= ~GENERIC_READ; + rdwr_for_fscache = 2; + goto retry_open; + } goto out; } + if (rdwr_for_fscache == 2) + cifs_invalidate_cache(inode, FSCACHE_INVAL_DIO_WRITE); #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY /* diff --git a/fs/smb/client/file.c b/fs/smb/client/file.c index 73573dadf90e..761a80963f76 100644 --- a/fs/smb/client/file.c +++ b/fs/smb/client/file.c @@ -521,12 +521,12 @@ cifs_mark_open_files_invalid(struct cifs_tcon *tcon) */ } -static inline int cifs_convert_flags(unsigned int flags) +static inline int cifs_convert_flags(unsigned int flags, int rdwr_for_fscache) { if ((flags & O_ACCMODE) == O_RDONLY) return GENERIC_READ; else if ((flags & O_ACCMODE) == O_WRONLY) - return GENERIC_WRITE; + return rdwr_for_fscache == 1 ? (GENERIC_READ | GENERIC_WRITE) : GENERIC_WRITE; else if ((flags & O_ACCMODE) == O_RDWR) { /* GENERIC_ALL is too much permission to request can cause unnecessary access denied on create */ @@ -663,11 +663,16 @@ static int cifs_nt_open(const char *full_path, struct inode *inode, struct cifs_ int create_options = CREATE_NOT_DIR; struct TCP_Server_Info *server = tcon->ses->server; struct cifs_open_parms oparms; + int rdwr_for_fscache = 0; if (!server->ops->open) return -ENOSYS; - desired_access = cifs_convert_flags(f_flags); + /* If we're caching, we need to be able to fill in around partial writes. */ + if (cifs_fscache_enabled(inode) && (f_flags & O_ACCMODE) == O_WRONLY) + rdwr_for_fscache = 1; + + desired_access = cifs_convert_flags(f_flags, rdwr_for_fscache); /********************************************************************* * open flag mapping table: @@ -704,6 +709,7 @@ static int cifs_nt_open(const char *full_path, struct inode *inode, struct cifs_ if (f_flags & O_DIRECT) create_options |= CREATE_NO_BUFFER; +retry_open: oparms = (struct cifs_open_parms) { .tcon = tcon, .cifs_sb = cifs_sb, @@ -715,8 +721,16 @@ static int cifs_nt_open(const char *full_path, struct inode *inode, struct cifs_ }; rc = server->ops->open(xid, &oparms, oplock, buf); - if (rc) + if (rc) { + if (rc == -EACCES && rdwr_for_fscache == 1) { + desired_access = cifs_convert_flags(f_flags, 0); + rdwr_for_fscache = 2; + goto retry_open; + } return rc; + } + if (rdwr_for_fscache == 2) + cifs_invalidate_cache(inode, FSCACHE_INVAL_DIO_WRITE); /* TODO: Add support for calling posix query info but with passing in fid */ if (tcon->unix_ext) @@ -1149,11 +1163,14 @@ int cifs_open(struct inode *inode, struct file *file) use_cache: fscache_use_cookie(cifs_inode_cookie(file_inode(file)), file->f_mode & FMODE_WRITE); - if (file->f_flags & O_DIRECT && - (!((file->f_flags & O_ACCMODE) != O_RDONLY) || - file->f_flags & O_APPEND)) - cifs_invalidate_cache(file_inode(file), - FSCACHE_INVAL_DIO_WRITE); + //if ((file->f_flags & O_ACCMODE) == O_WRONLY) + // goto inval; + if (!(file->f_flags & O_DIRECT)) + goto out; + if ((file->f_flags & (O_ACCMODE | O_APPEND)) == O_RDONLY) + goto out; +//inval: + cifs_invalidate_cache(file_inode(file), FSCACHE_INVAL_DIO_WRITE); out: free_dentry_path(page); @@ -1218,6 +1235,7 @@ cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush) int disposition = FILE_OPEN; int create_options = CREATE_NOT_DIR; struct cifs_open_parms oparms; + int rdwr_for_fscache = 0; xid = get_xid(); mutex_lock(&cfile->fh_mutex); @@ -1281,7 +1299,11 @@ cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush) } #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ - desired_access = cifs_convert_flags(cfile->f_flags); + /* If we're caching, we need to be able to fill in around partial writes. */ + if (cifs_fscache_enabled(inode) && (cfile->f_flags & O_ACCMODE) == O_WRONLY) + rdwr_for_fscache = 1; + + desired_access = cifs_convert_flags(cfile->f_flags, rdwr_for_fscache); /* O_SYNC also has bit for O_DSYNC so following check picks up either */ if (cfile->f_flags & O_SYNC) @@ -1293,6 +1315,7 @@ cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush) if (server->ops->get_lease_key) server->ops->get_lease_key(inode, &cfile->fid); +retry_open: oparms = (struct cifs_open_parms) { .tcon = tcon, .cifs_sb = cifs_sb, @@ -1318,6 +1341,11 @@ cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush) /* indicate that we need to relock the file */ oparms.reconnect = true; } + if (rc == -EACCES && rdwr_for_fscache == 1) { + desired_access = cifs_convert_flags(cfile->f_flags, 0); + rdwr_for_fscache = 2; + goto retry_open; + } if (rc) { mutex_unlock(&cfile->fh_mutex); @@ -1326,6 +1354,9 @@ cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush) goto reopen_error_exit; } + if (rdwr_for_fscache == 2) + cifs_invalidate_cache(inode, FSCACHE_INVAL_DIO_WRITE); + #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY reopen_success: #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ diff --git a/fs/smb/client/fscache.h b/fs/smb/client/fscache.h index a3d73720914f..1f2ea9f5cc9a 100644 --- a/fs/smb/client/fscache.h +++ b/fs/smb/client/fscache.h @@ -109,6 +109,11 @@ static inline void cifs_readahead_to_fscache(struct inode *inode, __cifs_readahead_to_fscache(inode, pos, len); } +static inline bool cifs_fscache_enabled(struct inode *inode) +{ + return fscache_cookie_enabled(cifs_inode_cookie(inode)); +} + #else /* CONFIG_CIFS_FSCACHE */ static inline void cifs_fscache_fill_coherency(struct inode *inode, @@ -124,6 +129,7 @@ static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {} static inline void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update) {} static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode) { return NULL; } static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags) {} +static inline bool cifs_fscache_enabled(struct inode *inode) { return false; } static inline int cifs_fscache_query_occupancy(struct inode *inode, pgoff_t first, unsigned int nr_pages,
When we're engaged in local caching of a cifs filesystem, we cannot perform caching of a partially written cache granule unless we can read the rest of the granule. To deal with this, if a file is opened O_WRONLY locally, but the mount was given the "-o fsc" flag, try first opening the remote file with GENERIC_READ|GENERIC_WRITE and if that returns -EACCES, try dropping the GENERIC_READ and doing the open again. If that last succeeds, invalidate the cache for that file as for O_DIRECT. Signed-off-by: David Howells <dhowells@redhat.com> cc: Steve French <sfrench@samba.org> cc: Shyam Prasad N <nspmangalore@gmail.com> cc: Rohith Surabattula <rohiths.msft@gmail.com> cc: Jeff Layton <jlayton@kernel.org> cc: linux-cifs@vger.kernel.org cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org cc: linux-mm@kvack.org --- fs/smb/client/dir.c | 15 ++++++++++++ fs/smb/client/file.c | 51 +++++++++++++++++++++++++++++++++-------- fs/smb/client/fscache.h | 6 +++++ 3 files changed, 62 insertions(+), 10 deletions(-)