diff options
Diffstat (limited to 'usr/src/uts/common/sys/fs/ufs_inode.h')
| -rw-r--r-- | usr/src/uts/common/sys/fs/ufs_inode.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/usr/src/uts/common/sys/fs/ufs_inode.h b/usr/src/uts/common/sys/fs/ufs_inode.h index d0815f62de..650314dcef 100644 --- a/usr/src/uts/common/sys/fs/ufs_inode.h +++ b/usr/src/uts/common/sys/fs/ufs_inode.h @@ -393,6 +393,52 @@ struct dinode { #define I_QUOTA 0x00000020 /* quota file */ #define I_NOCANCEL 0x40 /* Don't cancel these fragments */ #define I_ACCT 0x00000080 /* Update ufsvfs' unreclaimed_blocks */ + +/* + * If ufs_dircheckforname() fails to find an entry with the given name, + * this "slot" structure holds state for ufs_direnter_*() as to where + * there is space to put an entry with that name. + * If ufs_dircheckforname() finds an entry with the given name, this structure + * holds state for ufs_dirrename() and ufs_dirremove() as to where the + * entry is. "status" indicates what ufs_dircheckforname() found: + * NONE name not found, large enough free slot not found, + * FOUND name not found, large enough free slot found + * EXIST name found + * If ufs_dircheckforname() fails due to an error, this structure is not + * filled in. + * + * After ufs_dircheckforname() succeeds the values are: + * status offset size fbp, ep + * ------ ------ ---- ------- + * NONE end of dir needed not valid + * FOUND start of entry of ent both valid if fbp != NULL + * EXIST start of entry of prev ent valid + * + * "endoff" is set to 0 if the an entry with the given name is found, or if no + * free slot could be found or made; this means that the directory should not + * be truncated. If the entry was found, the search terminates so + * ufs_dircheckforname() didn't find out where the last valid entry in the + * directory was, so it doesn't know where to cut the directory off; if no free + * slot could be found or made, the directory has to be extended to make room + * for the new entry, so there's nothing to cut off. + * Otherwise, "endoff" is set to the larger of the offset of the last + * non-empty entry in the directory, or the offset at which the new entry will + * be placed, whichever is larger. This is used by ufs_diraddentry(); if a new + * entry is to be added to the directory, any complete directory blocks at the + * end of the directory that contain no non-empty entries are lopped off the + * end, thus shrinking the directory dynamically. + */ +typedef enum {NONE, FOUND, EXIST} slotstat_t; +struct slot { + struct direct *ep; /* pointer to slot */ + struct fbuf *fbp; /* dir buf where slot is */ + off_t offset; /* offset of area with free space */ + off_t endoff; /* last useful location found in search */ + slotstat_t status; /* status of slot */ + int size; /* size of area at slotoffset */ + int cached; /* cached directory */ +}; + /* * Statistics on inodes * Not protected by locks @@ -786,6 +832,8 @@ extern int ufs_dirmakeinode(struct inode *, struct inode **, struct vattr *, enum de_op, cred_t *); extern int ufs_dirremove(struct inode *, char *, struct inode *, vnode_t *, enum dr_op, cred_t *, vnode_t **); +extern int ufs_dircheckforname(struct inode *, char *, int, struct slot *, + struct inode **, struct cred *, int); extern int ufs_xattrdirempty(struct inode *, ino_t, cred_t *); extern int blkatoff(struct inode *, off_t, char **, struct fbuf **); |