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cifs: add fiemap support

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Useful for improved copy performance as well as for
applications which query allocated ranges of sparse
files.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Ronnie Sahlberg
2019-04-25 16:45:29 +10:00
committed by Steve French
parent d7bef4c4eb
commit 2f3ebaba13
8 changed files with 132 additions and 2 deletions
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37
fs/cifs/inode.c
View File

@@ -2116,6 +2116,43 @@ int cifs_getattr(const struct path *path, struct kstat *stat,
return rc;
}
int cifs_fiemap(struct inode *inode, struct fiemap_extent_info *fei, u64 start,
u64 len)
{
struct cifsInodeInfo *cifs_i = CIFS_I(inode);
struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_i->vfs_inode.i_sb);
struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
struct TCP_Server_Info *server = tcon->ses->server;
struct cifsFileInfo *cfile;
int rc;
/*
* We need to be sure that all dirty pages are written as they
* might fill holes on the server.
*/
if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
inode->i_mapping->nrpages != 0) {
rc = filemap_fdatawait(inode->i_mapping);
if (rc) {
mapping_set_error(inode->i_mapping, rc);
return rc;
}
}
cfile = find_readable_file(cifs_i, false);
if (cfile == NULL)
return -EINVAL;
if (server->ops->fiemap) {
rc = server->ops->fiemap(tcon, cfile, fei, start, len);
cifsFileInfo_put(cfile);
return rc;
}
cifsFileInfo_put(cfile);
return -ENOTSUPP;
}
static int cifs_truncate_page(struct address_space *mapping, loff_t from)
{
pgoff_t index = from >> PAGE_SHIFT;